biology
chemistry
physics
maths
general sci
100

Which organ produces insulin?

pancreas

100

What property of diffusing particles affects the rate of diffusion, with heavier particles diffusing slower?

Mass


100

 State and explain the principle of conservation of momentum. Apply it to a two-body elastic collision.

➤ Total momentum before a collision equals total momentum after the collision, provided no external forces act.
➤ In an elastic collision: m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

100

What is an equilateral triangle?

A triangle with all three sides equal.

100

What is the name of the basic unit of matter?

Atom

200

If a plant cell is placed in this type of solution, the cell will lose water and the plasma membrane will pull away from the cell wall.What type of solution is it?

Hypertonic solution 

200

What is the basic shape of the silicon-oxygen bonds in silicon dioxide?


Tetrahedral arrangement 

200

Explain what happens to the frequency and wavelength of a sound wave as it moves from air into water.
 

Frequency stays the same, wavelength increases because the speed of sound is higher in water.

200

18 is 20% of what number?

90

200

Which gas makes up about 1% of the air?

argon

300

Name the genetic tool is used to predict the possible genotypes and phenotypes of offspring from a cross

Punnet square

300

What color does methyl orange turn in an acidic solution?

Red

300

A ball is thrown vertically upward with an initial velocity of 20 m/s. Calculate the maximum height it reaches. (Take g = 9.8 m/s²)
 

 h = 20.41 m

300

A cube with a side length of 55 inches is painted black on all six faces. The entire cube is then cut into smaller cubes with sides of 11 inch. How many small cubes do not have any black paint on them?

27

300

How does the Doppler Effect explain why the pitch of an ambulance siren changes as it passes by?

As the ambulance approaches, the wavelength of the sound decreases and the observed frequency increases; as it recedes, the wavelength increases and the observed frequency decreases — illustrating the Doppler Effect.

400

Name the organ, located in the upper left quadrant of the abdomen, that filters blood and removes old or damaged red blood cells

spleen 

400

What is one compound that speeds up the process of acid rain formation?


Sulphur dioxide (SO2)

400

Kirchhoff’s Second Law from Energy Conservation

In a closed loop, net work done is zero — total EMF (energy supplied) equals total IR drops (energy used).

400

If a central angle in a circle is 60°, what is the measure of the angle at the circumference that cuts off the same arc?

30

400

In the stellar life cycle, what is the stage immediately before a star begins to fuse hydrogen in its core?

A protostar 

500

Given a maternal genotype devoid of B alleles and paternal alleles consisting of B and O, the potential phenotypic expressions in progeny would be?

AB, O, B and A

500

 If you have 12.044 x 10^23 atoms of carbon, this is the number of moles you have.

2 moles

500

Two slits 0.2 mm apart are illuminated with light of wavelength 600 nm. If the screen is placed 2 m away, calculate the distance between two adjacent bright fringes (fringe spacing).

0.006 m or 6 mm

500

Vanessa has a $900 travel and lodging budget for her vacation. She found round-trip plane tickets for x dollars total, a hotel for y dollars per night, and free shuttle service between the airport and the hotel. If she plans to stay at the hotel for 5 nights, and she spends less than what she budgeted on travel and lodging, which of the following inequalities best describes the scenario?

x+5y<900

500

Why do we see different constellations in the night sky during different seasons?

We see different constellations in different seasons because the Earth orbits the Sun, changing our nighttime view of space and revealing different regions of the sky at different times of the year.